TeuxDeux is a simple, designy to-do app and the first collaboration between studiomates swissmiss and Fictive Kin. If you like making to-do lists, you will love TeuxDeux. The idea was to build a bare-bones, but visually compelling and highly usable to-do app: Use the free browser-based TeuxDeux at work/home and then take your to-dos on the road with the iPhone app. Yay for checking things off!